Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aadf08214d63191…

MALICIOUS

PDF

76.0 KB Created: 2021-05-22 13:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7764e9a037941e4ee7efdd9d5938e1df SHA-1: 6a9e37ad76939f5e03d26e6bfcc642c6c74f4fa6 SHA-256: 2aadf08214d6319164bc2bfa20324f514ee299d2f254f0ca306aaa3a46bdae5d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=micrometer+screw+gauge+uses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417530/normal_602423f94cc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_6047d8ba7d9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_601091a498c54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_605be1480f1a2.pdfIn PDF document text
    • https://weposatozexutav.weebly.com/uploads/1/3/4/3/134314203/sofunamufipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5ffc9d0ee8806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_6061e91d72d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_6059ca86d56f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_60450e630bf21.pdfIn PDF document text
    • https://wufaxewixebel.weebly.com/uploads/1/3/5/3/135302410/2142768.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/fenulawefumutab.pdfIn PDF document text
    • https://tikofasej.weebly.com/uploads/1/3/4/6/134615027/d269ff3632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_60499dc7afd08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_5fe4597915c55.pdfIn PDF document text
    • https://mefirotevi.weebly.com/uploads/1/3/5/3/135314773/a9476c0d7b0e20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5fff40976140b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_606e78a0738d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/happy_birthday_piano_sheet_music_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295737b5-ec10-4134-ae92-db1f9c3d3933/tecumseh_8_hp_carburetor_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/octopus_plural_form.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/tiwonenogajaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ea7b0f-2e4a-4cb7-b231-ad204dbf0392/modern_elementary_statistics_12th_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/bollywood_movies_free_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e3f2c0-11c9-4a0b-9234-aeb2f69918d0/40587340340.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/walikojudijurigolukame.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 5184 bytes
SHA-256: dbb5a9df5863039406413549bfa1d4abc6e8204f674e6ffb8150651be0ef89c0
font_01_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 10600 bytes
SHA-256: 92f124f334cd3bf8f10d20a6006caccfceeab1a3e790ea1a7e71efebc0d0200e